fs/xfs/xfs_dquot_item.c

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_alloc.h"
  27 #include "xfs_quota.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_bmap.h"
  32 #include "xfs_rtalloc.h"
  33 #include "xfs_error.h"
  34 #include "xfs_itable.h"
  35 #include "xfs_attr.h"
  36 #include "xfs_buf_item.h"
  37 #include "xfs_trans_priv.h"
  38 #include "xfs_qm.h"
  39
  40 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
  41 {
  42         return container_of(lip, struct xfs_dq_logitem, qli_item);
  43 }
  44
  45 /*
  46  * returns the number of iovecs needed to log the given dquot item.
  47  */
  48 STATIC uint
  49 xfs_qm_dquot_logitem_size(
  50         struct xfs_log_item     *lip)
  51 {
  52         /*
  53          * we need only two iovecs, one for the format, one for the real thing
  54          */
  55         return 2;
  56 }
  57
  58 /*
  59  * fills in the vector of log iovecs for the given dquot log item.
  60  */
  61 STATIC void
  62 xfs_qm_dquot_logitem_format(
  63         struct xfs_log_item     *lip,
  64         struct xfs_log_iovec    *logvec)
  65 {
  66         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
  67
  68         logvec->i_addr = &qlip->qli_format;
  69         logvec->i_len  = sizeof(xfs_dq_logformat_t);
  70         logvec->i_type = XLOG_REG_TYPE_QFORMAT;
  71         logvec++;
  72         logvec->i_addr = &qlip->qli_dquot->q_core;
  73         logvec->i_len  = sizeof(xfs_disk_dquot_t);
  74         logvec->i_type = XLOG_REG_TYPE_DQUOT;
  75
  76         ASSERT(2 == lip->li_desc->lid_size);
  77         qlip->qli_format.qlf_size = 2;
  78
  79 }
  80
  81 /*
  82  * Increment the pin count of the given dquot.
  83  */
  84 STATIC void
  85 xfs_qm_dquot_logitem_pin(
  86         struct xfs_log_item     *lip)
  87 {
  88         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
  89
  90         ASSERT(XFS_DQ_IS_LOCKED(dqp));
  91         atomic_inc(&dqp->q_pincount);
  92 }
  93
  94 /*
  95  * Decrement the pin count of the given dquot, and wake up
  96  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
  97  * dquot must have been previously pinned with a call to
  98  * xfs_qm_dquot_logitem_pin().
  99  */
 100 STATIC void
 101 xfs_qm_dquot_logitem_unpin(
 102         struct xfs_log_item     *lip,
 103         int                     remove)
 104 {
 105         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 106
 107         ASSERT(atomic_read(&dqp->q_pincount) > 0);
 108         if (atomic_dec_and_test(&dqp->q_pincount))
 109                 wake_up(&dqp->q_pinwait);
 110 }
 111
 112 /*
 113  * Given the logitem, this writes the corresponding dquot entry to disk
 114  * asynchronously. This is called with the dquot entry securely locked;
 115  * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
 116  * at the end.
 117  */
 118 STATIC void
 119 xfs_qm_dquot_logitem_push(
 120         struct xfs_log_item     *lip)
 121 {
 122         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 123         int                     error;
 124
 125         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 126         ASSERT(!completion_done(&dqp->q_flush));
 127
 128         /*
 129          * Since we were able to lock the dquot's flush lock and
 130          * we found it on the AIL, the dquot must be dirty.  This
 131          * is because the dquot is removed from the AIL while still
 132          * holding the flush lock in xfs_dqflush_done().  Thus, if
 133          * we found it in the AIL and were able to obtain the flush
 134          * lock without sleeping, then there must not have been
 135          * anyone in the process of flushing the dquot.
 136          */
 137         error = xfs_qm_dqflush(dqp, 0);
 138         if (error)
 139                 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
 140                         __func__, error, dqp);
 141         xfs_dqunlock(dqp);
 142 }
 143
 144 STATIC xfs_lsn_t
 145 xfs_qm_dquot_logitem_committed(
 146         struct xfs_log_item     *lip,
 147         xfs_lsn_t               lsn)
 148 {
 149         /*
 150          * We always re-log the entire dquot when it becomes dirty,
 151          * so, the latest copy _is_ the only one that matters.
 152          */
 153         return lsn;
 154 }
 155
 156 /*
 157  * This is called to wait for the given dquot to be unpinned.
 158  * Most of these pin/unpin routines are plagiarized from inode code.
 159  */
 160 void
 161 xfs_qm_dqunpin_wait(
 162         struct xfs_dquot        *dqp)
 163 {
 164         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 165         if (atomic_read(&dqp->q_pincount) == 0)
 166                 return;
 167
 168         /*
 169          * Give the log a push so we don't wait here too long.
 170          */
 171         xfs_log_force(dqp->q_mount, 0);
 172         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
 173 }
 174
 175 /*
 176  * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
 177  * the dquot is locked by us, but the flush lock isn't. So, here we are
 178  * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
 179  * If so, we want to push it out to help us take this item off the AIL as soon
 180  * as possible.
 181  *
 182  * We must not be holding the AIL lock at this point. Calling incore() to
 183  * search the buffer cache can be a time consuming thing, and AIL lock is a
 184  * spinlock.
 185  */
 186 STATIC void
 187 xfs_qm_dquot_logitem_pushbuf(
 188         struct xfs_log_item     *lip)
 189 {
 190         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
 191         struct xfs_dquot        *dqp = qlip->qli_dquot;
 192         struct xfs_buf          *bp;
 193
 194         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 195
 196         /*
 197          * If flushlock isn't locked anymore, chances are that the
 198          * inode flush completed and the inode was taken off the AIL.
 199          * So, just get out.
 200          */
 201         if (completion_done(&dqp->q_flush) ||
 202             !(lip->li_flags & XFS_LI_IN_AIL)) {
 203                 xfs_dqunlock(dqp);
 204                 return;
 205         }
 206
 207         bp = xfs_incore(dqp->q_mount->m_ddev_targp, qlip->qli_format.qlf_blkno,
 208                         dqp->q_mount->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
 209         xfs_dqunlock(dqp);
 210         if (!bp)
 211                 return;
 212         if (XFS_BUF_ISDELAYWRITE(bp))
 213                 xfs_buf_delwri_promote(bp);
 214         xfs_buf_relse(bp);
 215 }
 216
 217 /*
 218  * This is called to attempt to lock the dquot associated with this
 219  * dquot log item.  Don't sleep on the dquot lock or the flush lock.
 220  * If the flush lock is already held, indicating that the dquot has
 221  * been or is in the process of being flushed, then see if we can
 222  * find the dquot's buffer in the buffer cache without sleeping.  If
 223  * we can and it is marked delayed write, then we want to send it out.
 224  * We delay doing so until the push routine, though, to avoid sleeping
 225  * in any device strategy routines.
 226  */
 227 STATIC uint
 228 xfs_qm_dquot_logitem_trylock(
 229         struct xfs_log_item     *lip)
 230 {
 231         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 232
 233         if (atomic_read(&dqp->q_pincount) > 0)
 234                 return XFS_ITEM_PINNED;
 235
 236         if (!xfs_qm_dqlock_nowait(dqp))
 237                 return XFS_ITEM_LOCKED;
 238
 239         if (!xfs_dqflock_nowait(dqp)) {
 240                 /*
 241                  * dquot has already been flushed to the backing buffer,
 242                  * leave it locked, pushbuf routine will unlock it.
 243                  */
 244                 return XFS_ITEM_PUSHBUF;
 245         }
 246
 247         ASSERT(lip->li_flags & XFS_LI_IN_AIL);
 248         return XFS_ITEM_SUCCESS;
 249 }
 250
 251 /*
 252  * Unlock the dquot associated with the log item.
 253  * Clear the fields of the dquot and dquot log item that
 254  * are specific to the current transaction.  If the
 255  * hold flags is set, do not unlock the dquot.
 256  */
 257 STATIC void
 258 xfs_qm_dquot_logitem_unlock(
 259         struct xfs_log_item     *lip)
 260 {
 261         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 262
 263         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 264
 265         /*
 266          * Clear the transaction pointer in the dquot
 267          */
 268         dqp->q_transp = NULL;
 269
 270         /*
 271          * dquots are never 'held' from getting unlocked at the end of
 272          * a transaction.  Their locking and unlocking is hidden inside the
 273          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 274          * for the logitem.
 275          */
 276         xfs_dqunlock(dqp);
 277 }
 278
 279 /*
 280  * this needs to stamp an lsn into the dquot, I think.
 281  * rpc's that look at user dquot's would then have to
 282  * push on the dependency recorded in the dquot
 283  */
 284 STATIC void
 285 xfs_qm_dquot_logitem_committing(
 286         struct xfs_log_item     *lip,
 287         xfs_lsn_t               lsn)
 288 {
 289 }
 290
 291 /*
 292  * This is the ops vector for dquots
 293  */
 294 static struct xfs_item_ops xfs_dquot_item_ops = {
 295         .iop_size       = xfs_qm_dquot_logitem_size,
 296         .iop_format     = xfs_qm_dquot_logitem_format,
 297         .iop_pin        = xfs_qm_dquot_logitem_pin,
 298         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 299         .iop_trylock    = xfs_qm_dquot_logitem_trylock,
 300         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
 301         .iop_committed  = xfs_qm_dquot_logitem_committed,
 302         .iop_push       = xfs_qm_dquot_logitem_push,
 303         .iop_pushbuf    = xfs_qm_dquot_logitem_pushbuf,
 304         .iop_committing = xfs_qm_dquot_logitem_committing
 305 };
 306
 307 /*
 308  * Initialize the dquot log item for a newly allocated dquot.
 309  * The dquot isn't locked at this point, but it isn't on any of the lists
 310  * either, so we don't care.
 311  */
 312 void
 313 xfs_qm_dquot_logitem_init(
 314         struct xfs_dquot        *dqp)
 315 {
 316         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 317
 318         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 319                                         &xfs_dquot_item_ops);
 320         lp->qli_dquot = dqp;
 321         lp->qli_format.qlf_type = XFS_LI_DQUOT;
 322         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
 323         lp->qli_format.qlf_blkno = dqp->q_blkno;
 324         lp->qli_format.qlf_len = 1;
 325         /*
 326          * This is just the offset of this dquot within its buffer
 327          * (which is currently 1 FSB and probably won't change).
 328          * Hence 32 bits for this offset should be just fine.
 329          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
 330          * here, and recompute it at recovery time.
 331          */
 332         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
 333 }
 334
 335 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 336
 337 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 338 {
 339         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 340 }
 341
 342
 343 /*
 344  * This returns the number of iovecs needed to log the given quotaoff item.
 345  * We only need 1 iovec for an quotaoff item.  It just logs the
 346  * quotaoff_log_format structure.
 347  */
 348 STATIC uint
 349 xfs_qm_qoff_logitem_size(
 350         struct xfs_log_item     *lip)
 351 {
 352         return 1;
 353 }
 354
 355 /*
 356  * This is called to fill in the vector of log iovecs for the
 357  * given quotaoff log item. We use only 1 iovec, and we point that
 358  * at the quotaoff_log_format structure embedded in the quotaoff item.
 359  * It is at this point that we assert that all of the extent
 360  * slots in the quotaoff item have been filled.
 361  */
 362 STATIC void
 363 xfs_qm_qoff_logitem_format(
 364         struct xfs_log_item     *lip,
 365         struct xfs_log_iovec    *log_vector)
 366 {
 367         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 368
 369         ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
 370
 371         log_vector->i_addr = &qflip->qql_format;
 372         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
 373         log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
 374         qflip->qql_format.qf_size = 1;
 375 }
 376
 377 /*
 378  * Pinning has no meaning for an quotaoff item, so just return.
 379  */
 380 STATIC void
 381 xfs_qm_qoff_logitem_pin(
 382         struct xfs_log_item     *lip)
 383 {
 384 }
 385
 386 /*
 387  * Since pinning has no meaning for an quotaoff item, unpinning does
 388  * not either.
 389  */
 390 STATIC void
 391 xfs_qm_qoff_logitem_unpin(
 392         struct xfs_log_item     *lip,
 393         int                     remove)
 394 {
 395 }
 396
 397 /*
 398  * Quotaoff items have no locking, so just return success.
 399  */
 400 STATIC uint
 401 xfs_qm_qoff_logitem_trylock(
 402         struct xfs_log_item     *lip)
 403 {
 404         return XFS_ITEM_LOCKED;
 405 }
 406
 407 /*
 408  * Quotaoff items have no locking or pushing, so return failure
 409  * so that the caller doesn't bother with us.
 410  */
 411 STATIC void
 412 xfs_qm_qoff_logitem_unlock(
 413         struct xfs_log_item     *lip)
 414 {
 415 }
 416
 417 /*
 418  * The quotaoff-start-item is logged only once and cannot be moved in the log,
 419  * so simply return the lsn at which it's been logged.
 420  */
 421 STATIC xfs_lsn_t
 422 xfs_qm_qoff_logitem_committed(
 423         struct xfs_log_item     *lip,
 424         xfs_lsn_t               lsn)
 425 {
 426         return lsn;
 427 }
 428
 429 /*
 430  * There isn't much you can do to push on an quotaoff item.  It is simply
 431  * stuck waiting for the log to be flushed to disk.
 432  */
 433 STATIC void
 434 xfs_qm_qoff_logitem_push(
 435         struct xfs_log_item     *lip)
 436 {
 437 }
 438
 439
 440 STATIC xfs_lsn_t
 441 xfs_qm_qoffend_logitem_committed(
 442         struct xfs_log_item     *lip,
 443         xfs_lsn_t               lsn)
 444 {
 445         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 446         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 447         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
 448
 449         /*
 450          * Delete the qoff-start logitem from the AIL.
 451          * xfs_trans_ail_delete() drops the AIL lock.
 452          */
 453         spin_lock(&ailp->xa_lock);
 454         xfs_trans_ail_delete(ailp, (xfs_log_item_t *)qfs);
 455
 456         kmem_free(qfs);
 457         kmem_free(qfe);
 458         return (xfs_lsn_t)-1;
 459 }
 460
 461 /*
 462  * XXX rcc - don't know quite what to do with this.  I think we can
 463  * just ignore it.  The only time that isn't the case is if we allow
 464  * the client to somehow see that quotas have been turned off in which
 465  * we can't allow that to get back until the quotaoff hits the disk.
 466  * So how would that happen?  Also, do we need different routines for
 467  * quotaoff start and quotaoff end?  I suspect the answer is yes but
 468  * to be sure, I need to look at the recovery code and see how quota off
 469  * recovery is handled (do we roll forward or back or do something else).
 470  * If we roll forwards or backwards, then we need two separate routines,
 471  * one that does nothing and one that stamps in the lsn that matters
 472  * (truly makes the quotaoff irrevocable).  If we do something else,
 473  * then maybe we don't need two.
 474  */
 475 STATIC void
 476 xfs_qm_qoff_logitem_committing(
 477         struct xfs_log_item     *lip,
 478         xfs_lsn_t               commit_lsn)
 479 {
 480 }
 481
 482 static struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 483         .iop_size       = xfs_qm_qoff_logitem_size,
 484         .iop_format     = xfs_qm_qoff_logitem_format,
 485         .iop_pin        = xfs_qm_qoff_logitem_pin,
 486         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 487         .iop_trylock    = xfs_qm_qoff_logitem_trylock,
 488         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 489         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 490         .iop_push       = xfs_qm_qoff_logitem_push,
 491         .iop_committing = xfs_qm_qoff_logitem_committing
 492 };
 493
 494 /*
 495  * This is the ops vector shared by all quotaoff-start log items.
 496  */
 497 static struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 498         .iop_size       = xfs_qm_qoff_logitem_size,
 499         .iop_format     = xfs_qm_qoff_logitem_format,
 500         .iop_pin        = xfs_qm_qoff_logitem_pin,
 501         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
 502         .iop_trylock    = xfs_qm_qoff_logitem_trylock,
 503         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
 504         .iop_committed  = xfs_qm_qoff_logitem_committed,
 505         .iop_push       = xfs_qm_qoff_logitem_push,
 506         .iop_committing = xfs_qm_qoff_logitem_committing
 507 };
 508
 509 /*
 510  * Allocate and initialize an quotaoff item of the correct quota type(s).
 511  */
 512 struct xfs_qoff_logitem *
 513 xfs_qm_qoff_logitem_init(
 514         struct xfs_mount        *mp,
 515         struct xfs_qoff_logitem *start,
 516         uint                    flags)
 517 {
 518         struct xfs_qoff_logitem *qf;
 519
 520         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
 521
 522         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 523                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 524         qf->qql_item.li_mountp = mp;
 525         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
 526         qf->qql_format.qf_flags = flags;
 527         qf->qql_start_lip = start;
 528         return qf;
 529 }